1321303103 has 4 divisors (see below), whose sum is σ = 1378751088. Its totient is φ = 1263855120.

The previous prime is 1321303099. The next prime is 1321303129. The reversal of 1321303103 is 3013031231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1321303103 - 2² = 1321303099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321303153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28723958 + ... + 28724003.

It is an arithmetic number, because the mean of its divisors is an integer number (344687772).

Almost surely, 2^1321303103 is an apocalyptic number.

1321303103 is a deficient number, since it is larger than the sum of its proper divisors (57447985).

1321303103 is an equidigital number, since it uses as much as digits as its factorization.

1321303103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57447984.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 1321303103 is about 36349.7331902175. The cubic root of 1321303103 is about 1097.3221648924.

Adding to 1321303103 its reverse (3013031231), we get a palindrome (4334334334).

The spelling of 1321303103 in words is "one billion, three hundred twenty-one million, three hundred three thousand, one hundred three".